Bone Rasp Protrusion for Spongy Bone Thickness Control
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Solution Overview
Problem
Current bone rasp tools used in joint arthroplasty procedures often remove too much spongy bone, leading to oversized channels and poor attachment of artificial joint implants, which can result in symmetry issues and implant failure.
Innovation Solution
A bone rasp apparatus with a protrusion extending beyond the material removal members to inhibit the removal of a second portion of bone material, ensuring a proper fit and attachment of the implant by spacing the material removal members from the denser compact bone layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If surgeons use traditional bone rasps to remove spongy bone and marrow, then the channel can be formed and sized, but the material removal members may remove too much spongy bone, resulting in an oversized channel and poor implant attachment
Solution Approach 1:
A protrusion extends beyond the material removal members to act as an intermediary barrier. This protrusion contacts the compact bone layer first, preventing the material removal members from removing excessive spongy bone. The protrusion mediates between the aggressive material removal action and the need to preserve sufficient spongy bone thickness for proper implant fit.
Solution Approach 2:
The protrusion performs a preliminary action by contacting and sensing the compact bone layer before the material removal members can remove excessive spongy bone. This preliminary contact establishes a stop point that prevents over-removal, ensuring the channel size remains within acceptable limits for implant attachment.
2Productivity
If material removal members aggressively remove spongy bone to form a channel, then channel formation is efficient, but the spongy bone thickness may be reduced to zero, resulting in oversized channels
Solution Approach 1:
The protrusion serves as a protective intermediary that contacts the compact bone layer to prevent material removal members from completely removing the spongy bone layer. This ensures sufficient spongy bone remains to provide reliable implant attachment while still allowing efficient channel formation.
Solution Approach 2:
The protrusion provides beforehand protection by extending beyond the material removal members to contact the compact bone layer first. This prior cushioning prevents the harmful effect of complete spongy bone removal, ensuring sufficient bone remains for reliable implant attachment.
3Adaptability or versatility
If the channel is made larger to accommodate implant variations, then implant fit flexibility increases, but the spongy bone layer may be completely removed, leading to poor implant attachment
Solution Approach 1:
The protrusion acts as a protective intermediary that prevents complete removal of the spongy bone layer, even when larger channel sizes are desired for implant flexibility. This ensures sufficient spongy bone thickness is maintained while still allowing appropriate channel sizing for different implant requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus prevents excessive removal of spongy bone, promoting a tighter fit and better attachment of the implant by maintaining a sufficient thickness of spongy bone within the channel, thereby enhancing the stability and integration of the artificial joint.
Implementation Method 1
The protrusion is configured to move within or through the first material and abut a second material, the first and second materials including adjacent layers. The protrusion is configured to space the material removal member from the second material by the first distance to inhibit the at least one material removal member from removing at least a second portion of the first material.
Data Source
AI summary
In some examples, an apparatus includes a working surface including at least one material removal member. The material removal member is configured to remove at least some of a first portion of a first material. A protrusion extends outwardly from the working surface. The protrusion extends beyond the at least one material removal member by a first distance. The protrusion is configured to inhibit the at least one material removal member from removing at least a second portion of the first material. The second portion has a thickness substantially equal to the first distance.